<template>
  <div class="home-category">
    <!-- 测试 -->
    <!-- <Skeleton width="100" height="30" bg="#333" /> -->
    <!-- <XtxSkeleton bg="red" /> -->
    <template v-if="leftNavs.length > 0">
      <ul class="menu">
        <!-- 一级 -->
        <li
          v-for="item in leftNavs"
          :key="item.id"
          @mouseenter="categoryId = item.id"
        >
          <RouterLink to="/">{{ item.name }}</RouterLink>
          <!-- 二级 -->
          <template v-if="item.children">
            <router-link v-for="sub in item.children" :key="sub.id" to="/">
              {{ sub.name }}
            </router-link>
          </template>
        </li>
      </ul>
      <!-- 弹层 -->
      <div class="layer">
        <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
        <ul v-if="currRecom && currRecom.goods">
          <li v-for="i in currRecom.goods" :key="i.id">
            <RouterLink :to="`/goods/${i.id}`">
              <img :src="i.picture" :alt="i.name" />
              <div class="info">
                <p class="name ellipsis-2">{{ i.name }}</p>
                <p class="desc ellipsis">{{ i.desc }}</p>
                <p class="price"><i>¥</i>{{ i.price }}</p>
              </div>
            </RouterLink>
          </li>
        </ul>
      </div>
    </template>
    <template v-else>
      <ul class="menu">
        <li v-for="i in 9" :key="i">
          <XtxSkeleton
            width="40"
            height="20"
            style="margin-right: 5px"
            bg="rgba(255,255,255,0.2)"
          />
          <XtxSkeleton
            width="120"
            height="20"
            bg="rgba(255,255,255,0.2)"
            style="margin-right: 5px"
          />
          <!-- <XtxSkeleton :width="50" :height="20" bg="rgba(255,255,255,0.2)" /> -->
        </li>
      </ul>
    </template>
  </div>
</template>

<script>
import { useStore } from 'vuex'
import { computed, ref } from 'vue'
// import Skeleton from '@/components/Skeleton'
export default {
  name: 'HomeCategory',
  // components: {
  //   Skeleton
  // },
  // computed: {
  //   ...mapState('category', ['navs']),
  //   leftNavs () {
  //     return this.navs.map(nav => {
  //       return {
  //         id: nav.id,
  //         name: nav.name,
  //         children: nav.children?.slice(0, 2)
  //       }
  //     })
  //   }
  // },
  // data () {
  //   return {
  //     categoryId: null
  //   }
  // },
  setup () {
    // 获取store数据
    const store = useStore()

    //  vue3计算属性
    // 1. 左侧默认显示的分类数据
    const leftNavs = computed(() => {
      // 基于vuex中的数据  截取children中的前俩项
      // 基于一个数组 针对于数据的每一项都做处理 然后返回一个全新的数组 map
      return store.state.category.navs.map((item) => {
        return {
          id: item.id,
          name: item.name,
          children: item.children.slice(0, 2)
        }
      })
    })
    // 2. 当前激活展示的推荐商品
    const categoryId = ref(null) // 当前hover经过一级分类的ID
    const currRecom = computed(() => {
      return store.state.category.navs.find(nav => nav.id === categoryId.value)
    })
    return { leftNavs, categoryId, currRecom }
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  // 左侧菜单
  .menu {
    li {
      padding-left: 40px;
      height: 55px;
      line-height: 55px;
      &:hover {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  // 弹层默认不显示
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            overflow: hidden;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
  // 显示弹层
  &:hover {
    .layer {
      display: block;
    }
  }
}
</style>
